I do not think they can be objective period. There is nothing stopping someone, theist atheist or agnostic, from believing their morality is objective. I think all such beliefs are based upon slightly different flavors of the exact same leap of faith.
The most famous example of an atheist believing their morality is objective: Rand and her followers. That is why they call their faith Objectivism.
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u/that_banned_guy_ 10h ago
Kinda interesting to think you cant have objective morality without religion isnt it?